[ANGLÈS] The project is built around Mobile Games. The core part of the project is the implementation of a Game APP, created with the knowledge. The name of the game is Guess The Year, and it is about a quiz in which you have to guess the year of some historical facts. It has some interesting game elements implemented, such as points, time, and a progress bar with your result. In this document you will first find an overview explanation of what games are and how to design one of them. Additionally, an extensive investigation of the current status of mobile games market will be included. This information will be later used to build the APP. Moreover, you will be able to see the process of creating the app. Since the idea of the game was generated until the testing was done, going through the app specification, its design and its implementation. Then, it will be shown how the marketing strategy was set. To conclude, the results it got in Google Play will be analyzed.